1-11/64 in Drill Size

fractional drill

1-11/64″ 1.1719 in 29.77 mm

A 1-11/64 in drill is the standard tap drill for 1-1/4-12.

What a 1-11/64 in drill taps

Every thread this drill cuts between 50% and 85% of thread, deepest first. Outside that band it is the wrong drill for the job, so nothing below that line is listed.

Threads a 1-11/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1-1/4-12 chart drill	72.1%	1-11/64″	72.1%
M33 x 3.5	71.1%	29.5 mm	77.0%

Drills either side

29.5 mm 1.1614 in · 29.5 mm Next size down
30 mm 1.1811 in · 30 mm Next size up

All drill sizes → · Open this drill in the calculator →

1-11/64 in drill: common questions

What size is a 1-11/64 in drill?

1.1719 inches, which is 29.77 mm. It is a fractional drill.

What can I tap with a 1-11/64 in drill?

2 threads: 1-1/4-12 at 72.1%, M33 x 3.5 at 71.1%.

Is a 1-11/64 in drill the standard tap drill for anything?

Yes, for 1-1/4-12 (72.1% thread). That is the size published tap and drill charts give.

What drill is next to a 1-11/64 in?

Down: 29.5 mm at 1.1614 in. Up: 30 mm at 1.1811 in.